Looking for info on the T-492. I've got chassis # H.U. 82 and I am in the process of restoring it. Needs a lot of work, lots of rust damage.

Does anyone know what material the engine sub-frame is constructed from? I am guessing 4130 chromoly but I can't get a good cross-section to determine the wall thickness. Any help is appreciated. Also if anyone has drawings of this car I would be forever grateful.